麻烦基于07c35ed rebase 一下

Hi@RPRX
the branch has been rebased

这是在解决什么问题？Golang 的新行为？

虽然 struct{} 在 Golang 中地位确实特殊

有相关解释发来看一下吗

你的意思是反正存储 true 或 false 都用不到，不如用空值struct{}？

@RPRX
in this specific casemap[string]bool is used as aSet, to keep unique values as keys of the map. Thebool is redundant and not needed. By havingstruct{} instead of irrelevantbool valueswe avoid unneeded memory allocation as well as we avoid confusion for developers

这下真把 map 用成集合了